1 /* $NetBSD: crx.h,v 1.4 2005/12/11 12:19:36 christos Exp $ */ 2 /* 3 * Copyright (c) 1988 Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Chris Torek. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)rx50reg.h 7.2 (Berkeley) 6/28/90 34 */ 35 36 /* 37 * RX50 registers. 38 */ 39 40 /* 41 * The names below do not quite match the DEC documentation simply because 42 * the names in the documentation are so bad. 43 */ 44 struct rx50device { 45 u_short rxid; /* identification */ 46 u_short reserved; 47 u_short rxcmd; /* command function reg */ 48 u_short rxtrk; /* track */ 49 u_short rxsec; /* sector */ 50 u_short rxcsc; /* current sector */ 51 u_short rxict; /* incorrect track (???) */ 52 u_short rxext; /* extend command register */ 53 u_short rxedb; /* empty data buffer (read) */ 54 u_short rxrda; /* reset data address */ 55 volatile u_short rxgo; /* read to start current cmd */ 56 u_short rxfdb; /* fill data buffer (write) */ 57 }; 58 59 #define RX50SEC 10 /* sectors per track */ 60 #define RX50MAXSEC 800 /* 10 sectors times 80 tracks */ 61 62 /* Interrupt vector */ 63 #define SCB_RX50 0xf0 64 65 /* 66 * Do the sector skew given the sector and track 67 * number (it depends on both!). 68 */ 69 /* (((((s) / 5) + 2 * ((s) + (t))) % 10) + 1) */ 70 #define RX50SKEW(s, t) (((s) / 5) + "\1\3\5\7\11\1\3\5\7"[((s) + (t)) % 5]) 71 72 /* 73 * Values in the command function register. 74 */ 75 #define RXCMD_ERROR 0x80 /* error bit (composite?) */ 76 #define RXCMD_READ 0x40 /* read command */ 77 #define RXCMD_WRITE 0x70 /* write command */ 78 #define RXCMD_RESET 0x20 /* reset command */ 79 #define RXCMD_DONE 0x08 /* operation done (status) */ 80 #define RXCMD_DRIVE0 0x00 /* select drive 0 (csa1) */ 81 #define RXCMD_DRIVE1 0x02 /* select drive 1 (csa2) */ 82